Yes, they are pretty much unobtanium at the moment, no idea if any more will be made, Scott is currently releasing a lot of MKIII modules so it could be that this will never be made again, but I don't know that!
Scott can be very slow to reply, but he usually does eventually.
I would not place an order expecting anything to arrive any time soon.
There are lots of alternatives, although none that I know of that will match this particular expression!
Frap Tools Falistri, Endorphin.es Grand Terminal, Make Noise Maths, etc.
If you are looking for the Harvestman flavour, you could perhaps try the original Double Andore, there are a few of those around, but again, they are not the same, although some folk would argue the original is the better of the two if you like super snappy envelopes.
What was it about the Double Andore MK][ you were specifically interested in? I might be able to help!